Infinity ERS 310

In-wall/in-ceiling speaker

  • Infinity ERS 310


  • Infinity ERS 310

    Grille off

  • Infinity ERS 310

Item# 108ERS310

Review Summary

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Our take on the Infinity ERS 310

by Tom Mathew

No room for speakers? No problem. You can install the ERS 310 speaker, sold individually, directly in your wall or ceiling. It features a flush-mount design and paintable grille, so it will disappear into your room without taking up an inch of floor space. And the speaker's large drivers and advanced technologies ensure rich, room-filling sound.

The ERS 310 sports a 8" woofer and 1" tweeter, both made of an exclusive Infinity driver material known as C.M.M.D.™. Stiff yet responsive, C.M.M.D. offers warm, resonance-free performance across the entire audio spectrum. It's the same material used on Infinity's flagship Prelude™ loudspeakers, costing thousands of dollars a pair. Plus, the ERS 310 includes a proprietary waveguide design that helps disperse sound evenly throughout your room.

This speaker's circular design makes it a popular choice for ceiling placement, but it's great for in-wall use, too. This stealth speaker is ideal for clutter-free multi-room audio, and also does a great job in an invisible home theater setup. Piece together your own voice-matched in-wall speaker system using Infinity's high-performance ERS speaker line.

The ERS 310 is designed for easy installation. It features mounting clamps that swing out and securely grip your ceiling from the inside. An optional in-ceiling bracket is recommended for installing this speaker in a new home under construction (or in a room that's undergoing major renovation).

Got wire?
Most speakers don't include any. Learn more about in-wall wiring at the Crutchfield Learning Center.
Shop our selection of in-wall speaker wire.


  • sold individually
  • 1" C.M.M.D. tweeter
  • 8" C.M.M.D. woofer
  • handles up to 135 watts
  • frequency response 45-22,000 Hz (±3dB)
  • sensitivity 89 dB
  • 8-ohm impedance
  • acoustical waveguide for wide sound dispersion
  • paintable speaker grille
  • cutout dimensions: 9-9/16" diameter
  • mounting depth: 4-3/8"
  • warranty: 5 years
  • Our 60-day money-back guarantee

Priced each


Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Enclosure Type
Video Shielded
Midrange Size
Woofer Size
Woofer Composition
Woofer Surround
Power Range (Watts)
up to 135
89 dB
Impedance (Ohms)
Frequency Response
Connector Type
Spring Clip
Bi-Amp Inputs
Parts Warranty
5 Years
Labor Warranty
5 Years
Product Research
What's in the box?

Download owner's manual

  • 1 White in-ceiling speaker
  • 1 White grille
  • 1 Plastic paint shield
  • Cardboard mounting cutout template
  • Infinity Logo Sticker
  • Owner's Guide
  • Warranty information

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Mounting Options


Ceramic Metal Matrix Diaphragm (C.M.M.D.): Infinity's C.M.M.D. technology delivers accurate performance with dramatically reduced distortion for incredibly lifelike sound. Additionally, the C.M.M.D. drivers can withstand extreme temperatures, moisture, humidity and sunlight.

Woofer: The 8" C.M.M.D. cone woofer virtually eliminates coloration due to cone flexing, resulting in less distortion and superior accuracy. For a smoother response and improved durability, the woofer uses a rubber surround.

Tweeter: The speaker has a 1" C.M.M.D. dome tweeter that offers superior stiffness and damping compared to traditional metal domes.

Waveguide Design: The ERS310 incorporates a proprietary waveguide design to ensure smooth distribution of sound throughout the listening area.

Mounting Options

Installation: The round shape and flush-design allow the ERS310 to mimic the look of a recessed lighting fixture. This speaker requires a cutout of 9.538", with a depth of 4.333" (including the thickness of the drywall). Once the hole is cut, the speaker can be dropped in and the locking tabs can be tightened, allowing you to secure the speaker to the drywall without any extra assembly.

Note: For new construction, you will need to purchase the optional rough-in-frame kit (item 108IW8RRIF).

Paintable: The grille and flange can be painted, allowing this speaker to match any decor.

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Infinity ERS 310 Reviews

Average Customer Review:

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4 out of 5

Very Good Speaker

Written By tx.jeff, Tyler,tx on Wednesday, April 29, 2009
I have the Infinity Primus speakers series with this speaker as surrounds. They work great! Hear everything just fine and I have 10ft ceilings. They are off 6-7' or so to the left and right of the main positon. They have very good bass. They are very comprable to bookshelf speakers. I dont regret buying them or any of my Primus speakers. However I think aimable tweeters would be a big help for the next improvement .
4 out of 4 people found this helpful
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3 out of 5

Good but not ideal

Written By Titan415, Richmond, VA on Sunday, February 18, 2007
I have always had 6.5" in-walls, but when I built this house I wanted to go with something with a little more oomph. I thought it would be okay, since there are two-way speakers like the old but excellent Boston Acoustics A70s sounded great.

I guess the main difference is that the A70s were in a perfectly designed cabinet. In-ceiling speakers, by definition, lack a decent cabinet, and so the results are less than stellar. I got the extra bass I wanted--after filling the cavity with poly-fil--but these speakers lack the clarity of the smaller 6.5" version.

My advice: Face the facts that in-ceiling speakers won't sound like box speakers and go for clarity over bass. Get the smaller ones.

98 out of 108 people found this helpful
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Add accessories for the Infinity ERS 310

UL-listed speaker wire is designed to be run through walls and is building code compliant. Most speakers don't include speaker wire. See all categories & accessories

AudioQuest FLX-16/2 16-Gauge 2-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
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AudioQuest FLX-14/4 14-Gauge 4-Conductor In-Wall Speaker Cable UL-approved for in-wall use; direct-burial rated (125 feet)
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